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Sample Size Considerations

April 19, 2019

Sample size is one of the most important decisions you can make in your research study design. PRC generally recommends a minimum sample size of 50 patient interviews per patient group per quarter or 200 per year since a sample that is too small will result in data that, when factoring in the error rate, is limited or even useless at a practical level. A sample that is larger than necessary simply wastes precious resources.